Which of the following statements about the organs of balance and equilibrium is false?
A. The three semicircular canals of the vestibular apparatus function in dynamic equilibrium.
B. At the base of each semicircular canal is a bulging region called the ampulla.
C. The brain receives and integrates signals from the semicircular canals on both sides of the head.
D. dynamic equilibrium allows you to keep your eyes locked on an object even when you swivel your head or nod.
E. Organs in the saccule and utricle act in the sense of dynamic equilibrium.
Answer: E
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Which of the following is the primary advantage of C4 plants over C3 plants?
A. C4 plants minimize photorespiration compared with C3 plants. B. C4 plants can produce sugars more efficiently than C3 plants under hot, arid conditions. C. C4 plants can produce CO2 needed for sugar production in the Calvin cycle more efficiently than C3 plants. D. Relative to C3 plants, C4 plants can keep their stomata closed more frequently to limit water evaporation, yet can still produce significant CO2 needed for sugar production. E. All of the choices are correct.
Globin chain switching replaces gamma chains with ________ chains in adult hemoglobin.
A) epsilon B) zeta C) beta D) alpha
Which of these best represents natural selection?
A) Recessive albinism is more common among the Hopi of Arizona than in the general population of the U.S. B) A gradual change in specific human mitochondrial DNA sequences occurs along the Nile river in Egypt. C) ABO blood type frequencies are similar in northern Africa, southern Spain, and the middle east. D) Lactose tolerant alleles are very prevalent in herding populations that drink milk as a staple.
Paleontological studies indicate that, over millions of years,
A. groups of species that have coevolved rise and go extinct together. B. species that occurred together in the distant past still occur together today; the community has held constant. C. the extinction of species is not related to the community in which they lived. D. species seem to come and go individually as niches within a community become available. E. species richness is constant over time.